Ortho-oxy-monoazo dye.



UNITED srn rns Pa iinr OFFICE.

W'ILLY SCIiUhLAOHER, OF HOCHST-ON-THE-MAIN, GERMANY, ASSIGNOR TO FARBWERKE VORM. MEISTER, LUCIUS & BRUNING, OF 'HOCHST-ON- THE MAIN, GERMANY, A CORPORATlON OF GERMANY.

ORTHO-GXY-MONOAZO DYE.

To rtZ/ whom it may concern.-

Be it known that I, WILLY ScHUMAcHER, Ph. D., chemist, a citizen of the United States of America, residing at Hdchst-on-the-Main, Germany, have invented certain new and useful Improvements in the Manufacture of a new Ortho-OXy-Monoazo Dyestuff, of which the following is a specification.

I have found that the ortho-oxy-monazo dyestuff representing the combination of the diazotized nitro-chlor-orth'o aniinophenol, (NO,:Cl:NI-I :OH:= 1: 2: 41 5,) which is a derivative of para-nitranilin and of paraehloro-phenol, with the l.8-dioXy-3.6disulfonic acid, is a very valuable dyestuff.

It may be produced, for instance, by allowing the diazotized nitro-chloro-amind phenol (NO,:CL:NH :OH= 1 :22415) to act upon 1.8-dioxy-3.6.-naphthalene disulfonic acid in presence of hydrate of lime. \Whenseparated from the acid solution, the dyestuif forms a dark bronze powder soluble in water with a red color. This solution be comes blue on addition of caustic alkali or sodium carbonate. In concentrated sulfuricacid the dye dissolves with a red-blue color. When heated with tin and hydrochloric acid, the dyestuff is reduced to oXy-chloropara-phenylenediamin and amino-chromotropic acid. it dyes wool in an acid-bath red color, which turns a beautifulsolid greenishblue when treated With chromates. Such a greenish-blue shade is also obtained by directly dyeing on chromemordanted wool.

The manufacture of the new dyestuff may be illustrated, for instance, as follows: 18.6 kilograms of nitro chlor amino phenol (NO,:Cl:NH :OH=12:415) are diazotized with twenty-five kilograms hydrochloric acid Specification of Letters Patent. Application filed March 20.1906. Serial No. 307,033.

Patented March 12, 1907.

of about Baum specific gravity and 6.9

kilograms nitrite and the diazo compound than added. to a solutionof thirty-eight kilograms of the disodium salt of the 1.8-dioxy 3.(S-naphthalene disulfonic acid stirred up with kilograms of lime. After a few hours stirring it is filtered, the dissolved lime may be precipitated by soda, and the dyestuif-is isolated from the solution by adding hydrochloric acid and common salt.

Having now described my invention, what I claim is As a new product the monoazo dyestuif which is the product of combination of diazotized nitrochlorortho-aminophenol, being a derivative of paranitraniline and of arachlorophenol, and of 1.8-dioXy-3.6'- naph thalene-disulfonic acid, it is a dark powder of bronze luster, soluble in water with a red color, which turns blue on addition of cans-- tic alkali or sodium carbonate, it dissolves in concentrated sulfuric acid with a red-blue color, on reduction by tin and hydrochloric acid the dyestufi forms oxy-chloro-paraphenylene diamin. OH Cl NH N11,: l :4 :2 :5 and amino-1.8-3.6-naphthalene-disulfonic acid; in an acid-bath it dyes wool red, this shade turns a beautiful fast greenish blue when treated with chromates, chrome-mordanted wool is also directly dyed such a greenish-blue shade.

In testimony that I claim the foregoing as my invention 1 have signed my name in presence of two subscribing witnesses.

WILLY SCHUMACHER.

Witnesses JEAN GRUND, CARL GnUNn. 

